Posted on 12/21/2011 7:31:56 PM PST by mamelukesabre
Can anyone here explain to me WHY a magnetron works? I am really not seeing it. Its driving me nuts.
Because it can
WHY? Or HOW? BIG difference! NO ONE can answer the former!
It think there’s a tractor beam somewhere in that pic.
It’s all done with magnets.
hmmm, its starting to make sense now
Under a magnetic field, electrons go in a circular path; with a small cavity (~10 cm dia) constricting them, gigahertz frequencies can be generated ....
... high enough to resonate the molecular bonds in water, heating them - the basis of the microwave oven
I read that. It doesn’t help me any.
There’s Photoshop and then there’s OMG!
'Eff it. Memorize the equations, and nod knowingly.
It does, however work. Even if you don't know what a Smith Chart is.
But don't take my word for it. I'm just a (former) cook.
/johnny
Midi-chlorians.
Yes... I can.
You have a thermionic emitter- a cathode, when it’s heated it emits electrons. The anode is charged positive and attracts the electrons and accelerates them to a very high speed.
These electrons are emitted into a magnetic flux put in place by peppermint magnets which causes them to travel in a circular path around the parameter of the anode which contains tuned cavities.
The result is that a high powered microwave signal is induced into the cavities buy induction. The frequency is determined by the circumference of the path and the electron speed.
Works fine, lasts a long time....
To put it in simple terms, I’ve heard them referred to as an electronic whistle. I stream of electrons is blown across the opening, which resonates the same way a coaches whistle does.
peppermint = permanent
/johnny
why and how are electrons in a funny copper doodad with a magnet going to cause electromagnetic radiation not only below the visible spectrum, but also below the infrared spectrum? Why does the cavity affect it? what is the magnet doing? why is the vacuum necessary?
"The principle is very similar to blowing a stream of air across the open top of a glass pop bottle."
Besides, what are you trying to do, build your own magnetron? Or you just have one and want to power it up? Some of these devices are pretty complicated and not exactly obvious. Some require a good understanding of physics (esp. semiconductors.)
LOL! I didn’t do it and I am never doing it again!
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